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I had issues with OAL varying and found that REALLY tightening the lock ring on the seat die fixed the issue and I get less than 3/1000ths varience.

QA testing... I also started out checking practically every round (powder measure, OAL and crimp) but have settled into a routine of:

Start session by throwing 10 powder loads back into hopper.

Measure powder charge and throw back into hopper (I also found the Lee Autodisk powder measure to be boringly consistant using Win 231)

Measure OAL after seating and after crimp (I crimp using Lee FCD).

Test crimp (Press bullet against table top FIRMLY) and remeasure OAL.

Load 24 more rounds and repeat measure cycle.